How to use the mongodb ID array to get multiple documents- How to get multiple document using array of MongoDb id?

problem ：

I have an array of ids and I want to get all document of them at once. I have a group id, I want to get all their documents at once .For that I am writing but it return 0 records. So , I'm writing , But it returns 0 Bar record .

How can I search using multiple Ids ? How to use multiple Id To search ？

db.getCollection('feed').find({"_id" : { "$in" : [  "55880c251df42d0466919268","55bf528e69b70ae79be35006" ]}})

I am able to get records by passing single id like I can pass a single id To get records

db.getCollection('feed').find({"_id":ObjectId("55880c251df42d0466919268")})

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Solution ：

Reference resources ： https://stackoom.com/en/question/2BNOj